I think it was John Kenneth Galbraith, speaking in the early 1960s, the high point of post-New Deal liberalism, who pronounced conservatism dead.
When John F. Kennedy was considering candidates to fill the post of Secretary of the Treasury, he asked the advice of Republican Robert Lovett, who had considerable experience on Wall Street. JFK wanted to know, what did people on Wall Street think of Galbraith's economic theories? Lovett answered, "He's a fine novelist."
LOL!